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if the BF is using the excuse of the older white GF to avoid having children? The presumption from many of the posters is that the BF is just passing time with GF. I suspect that if they had a child, the parents would come around. Maybe the real issue is that the BF does not want to tell his parents that he really does not want children. The GF is an easy excuse.
The man is in his forties. If he really wanted children, I suspect he could have had them already.
To the LW: Are you living in his house, your house, or a house that you both own? If it is your house, tell BF to either leave or have his parents over for dinner. If it is his house, keep your own place - and don't contribute one nickle on the upkeep. (You'll probably have to leave on short notice.) If it is a house that you both own, invite his parents over for dinner - and inform BF that they are coming for dinner. If nothing else, this issue will be settled one way or the other.
By the way, check out the movie "Saving Face." Lovely film about all kinds of coming out in an Asian family.